Department of Civil, Environmental and Plant Engineering, College of Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea.
Department of Environmental and Energy, College of Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea.
Chemosphere. 2018 Jan;191:520-526. doi: 10.1016/j.chemosphere.2017.10.072. Epub 2017 Oct 13.
In this study, lab-scale batch tests were conducted to investigate releasing characteristics of heavy metals according to degradation of heavy metal containing biomass. The fate of heavy metals after released from biomass was also determined through adsorption tests and Visual MINTEQ simulation. According to the anaerobic batch test results as well as volatile solids and carbon balance analyses, maximum of 60% by wt. of biomass was degraded. During the anaerobic biodegradation, among Cd, Cu, Ni, Pb, and Zn, only Cu and Zn were observed in soluble form (approximately 40% by wt. of input mass). The discrepancy between degradation ratio of biomass and ratio of released heavy metals mass from biomass was observed. It seems that this discordance was caused by the fate (i.e., precipitated with sulfur/hydroxide or adsorbed onto sorbents) of each heavy metal types in solution after being released from biomass. Thus, releasing characteristics and fate of heavy metal should be considered carefully to predict stability of anaerobic digestion process for heavy metal-containing biomass.
在这项研究中，进行了实验室规模的批量测试，以根据含重金属生物质的降解来研究重金属的释放特性。通过吸附试验和 Visual MINTEQ 模拟，确定了重金属从生物质中释放后的去向。根据厌氧批量测试结果以及挥发性固体和碳平衡分析，最大可达 60%的生物质按重量计被降解。在厌氧生物降解过程中，在 Cd、Cu、Ni、Pb 和 Zn 中，只有 Cu 和 Zn 以可溶形式存在（约占输入质量的 40%）。观察到生物质降解率与从生物质中释放的重金属质量比之间存在差异。这种差异似乎是由于每种重金属类型在从生物质中释放后在溶液中的去向（即与硫/氢氧化物共沉淀或被吸附到吸附剂上）所致。因此，在预测含重金属生物质的厌氧消化过程的稳定性时，应仔细考虑重金属的释放特性和去向。
